Improvement in cibcular-saw mills



nitrntats @strat @fitta JOHN TODD,- or BELLnroNTE, YPENNsrmniNA,AssIeNon' To HIMSELF AND 'WILLIAM r. DUNCAN, or sans PLAGE'.

Letters Patent No. 72,763, dated- Deeember 3l, 1867, Y

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TO ALL WHOM IT MAY CONCERN: I

Be itknown that I, JOHN TODD, of Bellefonte, in the county of Centro,and State of Pennsylvania, have invented certain new and usefulImprovements in Sawing-`Apparatus; and I do hereby declare tho followingto be a full, clear, and exact description of the same, reference beinghad to the accompanying drawings, inaking a part of this specification,in whichv Figure 1 represents a top plan of a sawing-machine.

Figure 2 represents a-longitudinal vertical section through the same.

Figure 3 represents a vertical transverse section. v

Figure 4 represents a vertical longitudinal section, showing in blackand in red lines the diiferent positions of the working parts.

Figure 5 representen detached View of the connection of the pivoted andweighted lever with the pivoted rack or segment-frame that supports theshafts of the frietlional driving-wheels at one of their ends, theopposite ends being supported on the main frame. l

Similar letters of reference, whore they occur in the separate figures,denote like parts in all of the drawings.

My invention consists in the'manner in whichI hang, adjust, and operatethe frame that supports those ends of the shafts that carry thefriet-ional feeding and backing-wheels, so that the latter may he throwninto or out of action with the drive-wheel, at the will of the operator,whilst the weighted lever will, when not controlled by the operator,hold both friction-wheels out of aetien'with the drive-wheel, as will beexplained.

To enable others skilled in the art to make and use my invention, I willproceed to describe the same with reference to the drawings.

A represents avrcctangular frame, for holding the saw, andngearing thatdrives it, and feeds up the log and runs back the carriage. B is thesaw-shaft, on which is the pulley C, by which it is run. The saw D isplaced ono-ne of theprojectng ends of the shaft, and the pulleys l 2 3 4on the other end. The shaftE receives the motion which feeds up-thecarriage, bolt, or log to the saw, and runs it back again to be set foranew kerf or4 throughf Any of the known ways of holding the log or boltto the carriage, or head and tail-blocks, may be used. The saw-shaft Band the feeding and reversing-shafts E run in permanent bearings. Theother revolving shafts of the apparatus run in yielding bearings, aswill be explained. From the pulley 1 on the shaft B, an endlesslbelt, a,extends to and passes over a pulley, 5, on a shaft, F; and from thepulley 2, on the saw-shaft, au endless belt, I, passes to AandV over apulley, 6, on another shaft G, there being other pulleys, 7 8, on saidshaft, of different diameters as are those 1 2 3 4, so as to changespeed or motion in the usual way. The journals of the shafts F G, neartheir pulley-ends, run in pivoted or swinging boxes c, so that theoppositeV ends may rise and fall without cramping or bindingrthe shafts.The pulley-ends of these shafts rest and rotate in journalboxs, arrangedon the main frame. Their other ends are supported and turn in swivellingboxes z', on a second frame, H, which is pivoted to the main frame bymeans of the rod or band, on which it can swing or vibrate. On the frontof the hinged frame H there is a curved rack, e, and on a eross-rod, I,that turns invsupportsff, connected to and adjustable on the main frame,there is a'segment, y,that works in said rack, by turning the lever L soas to raise or lower the free end of said frame H, as may he required.On the feed-shaft E there is a-ilanged wheel,iJ, on or against theexterior of which the wheel or friction-pulley j, ou the end of theshaft G, can work or run, to turn said wheel J and shaft E, and againstthe interior or under side of which rim or ange, the friction-wheel orpulley c on the shaft I" can work or run, to turn said wheel and shaftin a contrary direction, the wheely'making the feed of the carriage, andthe wheel lc running it back. When the frame H is raised up, the wheel cis in action, andthe carriage or log is run back. When the frame l-I islowered, the wheel j is in action, and the carriage or log is fed up tothe saw. But there is another inactive position for h oth of the wheels,necessary, so that neither shall work, which is obtained asfollows: Tothe shaft d, and in a. recess in the rear of the frame-piece H, there ispivotcd a lever, K, upon which there is an adjustable counterpoise, L,and below this counterpoise or weight a support, l\I, so that when theweight is on the support, neither of the friction-wheels j k is incontact with the driven wheel ,Land-then there is no motion given to theshaft E. The

pivoting of the lever K.to the frame H, enables the weight to raise upthe frame'to a xed or given height, whilst the frame can be furtherraised up, independent of 'the lever K, by means of the lever h, segmentg, and rack' e. -m is a brace, for holding the wheelj in action with thewheel J, when the `operator desires to do so.

What Ivclaim as new, and desire to secure by Letters Patent, is-

Ip combination with the hinged frame H for moving the frictional feedand backing-wheels into and out `nf action with the drive-wheel and itsshaft, the pivoted weighted lever K, jointed to the frame as described,

and its support M for holding both of said wheels out of action,substantially as and for the puposc described.

JOHN TODD.

Witnesses:

A. B.' SToUGHToH, EDM. F. BROWN.

